The problem with just about every virtual desktop implementation is just that - they're virtual. This means that beyond the ability to move windows to specific desktops, you're still looking at exactly the same desktop, no matter what virtual desktop number you switched to. A mockup for GNOME Shell is trying to take the virtual out of virtual desktop.

I am unable to understand how that menu is more useful over the old classic menu.

The developers did a good systematic usability study on it, and found it better for the most common usage patterns. But for people like you, who have an usage pattern or mind not compatible with those improvements, the classic menu is available with 2(3) clicks. So basically you loose nothing, but other users gain an improvement, making your complaining void.